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Thread: still under 400 hp
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10-11-2008, 09:22 PM #1Junior Member
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still under 400 hp
hi i have strocker 408 im my chevy ingine with:
1.ls6 heads
2.long headrs
3.extream cam
4.bbk body thurtol
5.afe intake
6.Gibson Super Truck Exhaust Systems
7.LS6 intake manifold
still i`m under 400 hp what should i do or are there anything rong with my setup
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10-11-2008, 10:37 PM #2Senior Member
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pewter- 2001 z28 lingenfelter 383
i can only assume u mean 400 rear wheel hp.........how about having it tuned?????? hard to read much of what u wrote but i would expect at least 430-450 rwhp with that setup
Originally Posted by speeedo
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10-11-2008, 11:27 PM #3Junior Member
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thanks for your fast replay put this after the tuned
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10-12-2008, 06:43 AM #4Member
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red with black stripes- 2002 Trans Am WS6
im not an engine builder or anything but it mught not be breathing that well. you got a cam for the 408 but heads and intake for a 346. better heads and a FAST intake should get you above 400. it all depends what the compression ratio is too. again im not an expert on this but thats what i think.
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10-12-2008, 07:02 AM #5Junior Member
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the compression ratio is 12:1 and i have zo6 heads and intake Originally Posted by stephen02ws6
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10-12-2008, 07:15 AM #6Member
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red with black stripes- 2002 Trans Am WS6
ya but a 346 Z06. are they the base ls6 heads or are they ported and polished? just because they are from a Z06 doesnt mean they are the best or make the most power for your situation. Originally Posted by speeedo
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10-12-2008, 07:25 AM #7Rice Killa
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Black With T-Tops- 96 Z28 M6
Very well said.
I agree with Stephen
300RWHP, 341RWTQ
1/8 mile 8.32 at 83.97
1/4 mile 13.049 at 105.24
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10-12-2008, 07:56 AM #8Senior Member
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Black- 2001 Trans Am (sold)
Ditto. Cam specs as well? 1 7/8ths headers? Originally Posted by stephen02ws6
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10-12-2008, 08:14 AM #9Slow'er'Ass
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Red Tint Jewelcoat- 2008 Trailblazer SS
Cam specs are a must to understand what is going on.
What transmission?
You figure there are MANY 346's making over 400RWHP with stock LS1 heads...why wouldn't a 408 make at least that much with those parts?2008 Trailblazer SS
Yank PTB3600, Kooks 1 7/8" LT's, 4" intake, E-fans, Magnaflow, Sonnax kit, tranny cooler, tune.
Lowered, HID's, tinted.
1999 Pontiac Trans Am WS.6 #1747 SOLD
531.1 RWHP 481.3 FT/Pounds all motor.
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10-12-2008, 08:26 AM #10Senior Member
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black- 2002 WS6
I share the sentiment with those above, The engine is most likely being starved for fuel. The "stock" GM head are not built to flow a radacle cam. You need after market heads with some work done to achieve the needed flow rate.
People see how much air the head flows, but what about how fast? velocity is just as important as CFM.
Also what is you measured fuel pressure?
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10-12-2008, 08:53 AM #11Senior Member
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Blue- 2002 Z28 Camaro M6
We also need to know what kind of dyno you are using a Mustang dyno will show much lower numbers.
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10-12-2008, 04:00 PM #12Member
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White- 2001 Z28
I agree, this engine if properly tuned should be pushing 500hp. I suggest you try another pull on a different dyno.
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10-12-2008, 04:04 PM #13Junior Member
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what heads should i use ? the zo6 heads are i think 68cc should i use heads arounde 64cc ? i need sum cheap heads thats why i had the zo6
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10-12-2008, 05:08 PM #14I flame retards
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QuickSilverMetallic- 2005 GTO M6
I agree with it being starved. It should be well above that 400hp mark.
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10-13-2008, 05:42 AM #15O U 8 1 2
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[]D [] []V[] []D- 1999 trans am
what size fuel injectors and fuel pump???
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10-13-2008, 06:09 AM #16Member
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Red- 1998 Camaro SS
68cc and 64cc is the combustion chamber size. That really only effect your compression ratio. AFR recommends “Our 225cc intake runner cylinder head is ideal for normally aspirated 396C.I. to 427C.I.” Where stock LS6 heads are only have 210 cc intake runners. With that much displacement you are going to need larger intake runners and larger valves to let the engine breath properly then a stock LS6 Head can provide. Originally Posted by speeedo
Last edited by vetteemt; 10-13-2008 at 08:23 AM.
1998 Camaro SS Hard Coupe Bright Red #1593
Mods: Lots!!, still my daily driver except for winter
383rwhp 370rwft/lbs
1979 Corvette
Mods Lots!!, weekend cruiser
325rwhp and 320rwft/lbs
2007 Dodge Ram 1500 4x4 (Yes its got a HEMI)
Mods: Catback, BFI CAI, Winter daily driver
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10-13-2008, 11:01 AM #17Junior Member
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sum pepole adivce me to put the new ls3 heads its 63cc and 230 intake runner what you think guys ? they are kinda cheap and do the job
Last edited by speeedo; 10-13-2008 at 11:04 AM.
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10-13-2008, 11:03 AM #18Junior Member
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20 and i`m going to 60 but i should tuned it and the fuel is stock should i chang it ? Originally Posted by Spaz
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10-13-2008, 11:06 AM #19O U 8 1 2
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[]D [] []V[] []D- 1999 trans am
20lb injectors?! you'll need around 36 or so... could probably get away with 32... 60 is an over kill... Originally Posted by speeedo
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10-13-2008, 11:10 AM #20Slow'er'Ass
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Red Tint Jewelcoat- 2008 Trailblazer SS
Yes. Originally Posted by speeedo
Your stock pump isn't good to much over 400HP.
Injectors...should be 36-42 pounders.
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